Temperature controlled alarm



y 1942- L H. B. MlLLEk ETAL 2,288,591

TEMPERATURE CONTROLLED ALARM 1 1 Filed my 27', 1940 2 Sheets-Sheet 1 2-? r7 f 8 7/ ,74- 76 INVENTORS "HAROLD B. M/LLER AXEL 7T ANDERSON ATTORNEY July 7,19 l2. WLLER m 2,288,591

TEMPERATURE CONTROLLED I ALARM Filgd May 27, 194;: 2 Sheets- Sheet 2 m'wg am: Bi AXEL 1 T ANDERSON ATTORNEY Patented July 7, 1942 UNITE-D STATES- 11 PATENT OFFICE "2,288,591 TEMPERATURE CONTROLLED ALARM I 'Haro'ld B. 'Miller Axel T. Anderson,

Minneapolis, Minn.

Application May 27, 1940, Serial. No. 337,522 16 Claims. ,(Ql. l16 10'2 ating spring of the alarm becomin gunwound or v run down.

A further object is to provide a spring wound temperature controlled alarm whichwill include a novel and improved construction and arrangement for indicating when the alarm is set for operation and is run down.

A further object is to provide a temperature controlled alarmwhich will include a sound producing device or siren, a spring'motor operatively connected to said sound producing device or siren to cause it to be actuated, novel and improved 1 mechanism for normally retaining said spring motor stationary and said sound producing device or siren inoperative, and a thermostatic element independent of said mechanism, motor and sound producing device or siren for causingthe mechanism to release the motor and sound producing device or siren.

A further object is to provide a spring wound temperature controlled alarm which will include a novel and improved construction and arrangement for causing said alarm to be set for operation or re-set after an actuation of the alarm.

A further object is toprovide a temperature controlled alarm which will include a sound producing device or siren, a spring motor operatively connected to said sound producing device or siren to cause it to be actuated, mechanism for normally retaining said spring motor stationary and said sound producing device or siren inoperative, a thermostatic element for causing the mechanism to release the motor and sound producing device or siren, and a construction and arrangement independent of said thermostatic element for causing said alarm to be set for operation or reset afteran actuation of the alarm.

And a further object is to provide a spring wound temperature controlled alarm which will include a novel and improved construction and arrangement for causing a sound producing device or siren in proximate relation to the alarm to be actuated-Iand asignal .in remote relation to said alarm to be simultaneously made discernible.

With the above objects in view,.as well as others which will appear as the specification proceeds, the invention comprises the construction, arrangement and combinationof parts as now to befully described and as hereinafterto be specifically claimed, it being-understood that the disclosure hereinis merely illustrative and intended in no way in a limiting sense, changes in details of construction and arrangement of parts being permissible so long-as they remain within the spirit of the invention andthe scope of the claims which follow.

In the accompanying drawings vforming apart of -this specification,

"Fig. Lisa front elevational View of atempera- ;turecontrolled alarm made according to the invention;

Fig. 2' is a vertical sectional view, taken on line 2-4 in Fig. 1;

Fig.3 is anenlargedrearelevational view of the disclosure of 'Fig. -l with the rearward wall of the frame or cabinet removed;

Fig. 4 is an enlarged fragmentary top plan view of the disclosure'of "Fig. l with the upper wall of the frame or cabinet removed;

Fig. 5 is an enlarged fragmentary horizontal sectional view of the alarm;

Fig.6 is adetail sectional view, taken on line 66 in Fig. 5; and

Fig. 7 is a diagrammatic view of a construction and arrangement for making -a signal in remote relation to the temperature controlled alarm discernible simultaneously with actuation of said: alarm.

With respect to the drawings and the numerals of reference thereon, a frame or cabinet ID "of the temperature controlled alarm is of rectilinear configuration and includes an upper Wall I'I,';a lower wall-l2, a front Wall 13-, a rear wall l4, side or'end' walls l5 and lfigand a horizontal partition wall ll dividing the frame or cabinet intoan upper compartment I8 and a lower :compartment [9.

'A 'spring m'otor zllyand' speed increasing gearing, denoted generally "at 2|, are situated within the lower compartment 1-9 andare-suitably and conveniently mounteduponthe rear wall 14 andthe front wall 13, as well 'as'upon aver-- tical plate 22 situated between'and in parallel, spaced relation to said rear and front walls and .fixed, as at 23, upon said lower wall l-2.

More explicitly, the spring motor 20 includes a shell 24 rotatably mounted upon a horizontal shaft 25 having its opposite end portions rotatably mounted in the rear wall l4 and the vertical plate 22, respectively, and a coil or clock spring 26 within the shell 24 having its inner end secured, as at 21, to said horizontal shaft 25 and its outer end secured, as at 28, to the inner surface of a circumferential portion of said shell.

A winding stem .29 for the spring motor 26 is rotatably mounted in the end or side wall I5, and a ratchet wheel 36 fixed to said winding stem is adapted to be releasably engaged by a pawl 3| pivoted upon the inner surface of said end or side wall l to permit turning movement of the winding stem to cause the spring motor to be energized and to preclude turning movement of said winding stem in opposit direction. A leaf spring 32 back of said pawl resiliently retains the l pawl in engagement with the ratchet wheel 36. A bevel gear 33 fixed on the winding stem 29 is in mesh with a bevel gear 34 fixed on a stub shaft 35 mounted in the rear wall l4, and a gear wheel 36 fixed on said stub shaft is in mesh with a gear wheel 31 rotatably mounted on the horizontal shaft 25 and rigid with the shell 24. Assuming said horizontal shaft 25 to be held stationary, it is apparent that the spring motor 26 can be energized in response to turning movement of the winding stem 29 and retained in energized condition by engagement of the pawl 3| with the ratchet wheel 39.

The speed increasing gearing 2| includes a relatively large gear wheel 38 situated adjacent the vertical plate 22 and fixed on the horizontal shaft 25, and a driving shaft 39, rotatably mounted on the vertical plate 22 and the front wall l3, for a sound producing device or siren 46 is adapted to be driven at high speed by the spring motor through the instrumentality of said gear wheel 38, a smaller gear wheel 4| fixed on a second horizontal shaft 42 rotatably mounted in said vertical plate and front wall, a larger gear wheel 43 fixed on said shaft 42, a smaller gear wheel 44 fixed on a third horizontal shaft 45 rotatably mounted in said vertical plate and front wall, a larger'gear wheel 46 fixed on said shaft 45, and a smaller gear wheel 41 fixed on the driving shaft" 39. The sound producing device or siren 40 is rigidly supported, as at 43, upon the outer surface of the front wall l3 of the frame or cabinet Ill. The construction and arrangement are such that rotation of the driving shaft 39 will cause the device or siren 46 to produce sound or noise.

The speed increasing gearing 2| is adapted to be fastened or locked against turning movement, when this is intentional, to retain the sound producing device or siren inactive against tendency of the spring motor when energized toward actuating said device or siren, and to be released for turning movement, when this is intentional, to permit said sound producing device or siren to be actuated by said spring motor. Mechanism for fastening or looking and releasing said gearing 2| is, in the main, situated within the upper compartment I8 of the frame or cabinet.

A vertical lever 49, pivotally mounted, as at 50, upon an ear or ears supported by the horizontal partition wall ll, includes a lower, shorter arm 5| of said lever in the lower compartment I9 extending obliquely downwardly from the wall H in direction substantially tangentially of the gear wheel 46, and an upper, longer arm of the lever extending upwardly through an elongated slot 52 in said wall I l.

The lower end of the lower, shorter arm 5| of the vertical lever 49 includes an integral hook 53 which as shown is substantially perpendicular to said lower, shorter arm and is disposed substantially radially of the gear wheel 46. Said integral hook is adapted to be selectively engaged between gear teeth 54 upon said gear wheel 46 to lock or fasten the gearing 2| against movement and to be released from engaging position between gear teeth 54. The construction and arrangement are such that when the integral hook 53 is engaged between gear teeth 54, tendency toward rotation of the gear wheel 46 is overcome by the lower, shorter arm 5| acting along a line which extends tangentially of said gear wheel and through the pivotal support 50. Thus, the teeth 54 of the gear wheel 46 will exert no appreciable force tending to cause said integral hook to become removed from engagement with said gear wheel, and tendency toward turning movement of the gearing 2| will be resisted directly by said pivotal support 56.

The upper, longer arm of the vertical lever 49 extends upwardly in the upper compartment l8 and is of general V-shape. A lower portion 55 of the upper, longer arm, adjacent the pivotal support 56, is disposed obliquely to the horizontal partition wall l1 and in substantially right-angle relation to the lower, shorter arm 5|, and an upper portion 56 of said upper, longer arm is disposed directly above said lower portion 55. The lower portion 55 and the upper portion 56 of the upper, longer arm of the vertical lever 49 may be of substantially equal length, and said lower and upper portions 55 and 56 meet at a location 51 disposed intermediate the top wall II and the partition wall ll. The upper end of the longer arm 56 rigidly supports a lug 58.

A resilient element 59, engaged by the lug 58, has potential to cause the upper, longer arm of the vertical lever 49 to be swung in direction, toward the right in Fig. 3, to cause the integral hook 53 upon the lower, shorter arm 5| of said vertical lever to become removed from between teeth 54 of the gear wheel 46. In the illustrated embodiment of the invention, the resilient element 59 is an electrical conducting member and is insulatively supported, as at 66, upon the inner surface of the front wall l3 of the frame or cabinet Ill. The lug 58 will desirably be composed of insulating material.

A second vertical lever 6|, for retaining the integral hook 53 upon the lower, shorter arm 5| of the vertical lever 49 engaged between teeth 54 of the gear wheel 46 against tendency of the resilient element 59 toward causing said integral hook to become removed from said gear wheel, is pivotally mounted, as at 62, upon ears supported by the horizontal partition wall 51. Said second vertical lever 6| includes a lower, shorter arm 63 of said lever in the lower compartment l9 extending substantially perpendicularly downwardly through the elongated slot 52, and an upper, longer arm of the lever extending upwardly in the upper compartment l8.

The lower end portion of the lower, shorter arm 63 of the vertical lever 6| is rounded or curvilinear, as at 64, and the rounded or curvilinear portion 64 is adapted to be constantly engaged against the surface of the lower end portion of the lower, shorter arm 5| of the vertical lever 49 which is opposite the integral hook 53, as will be clear from Fig. 3.

The upper longer arm of the vertical lever 6| extends upwardly in the upper compartment I8. A lower portion 65 of said upper longer arm, ad-

opposite the vertical lever 49.

wall it. thereof adjacent the ends of the tubular guides the lower tubular guide H.

second vertical lever is disposed inoblique angle relation to the lowerportion 55 and extends away from the side of said lower portion 65 which is Said vertical 1ever 49, the second vertical lever 9| and the gear wheel 49 are situated in a single vertical plane disposed longitudinally of the frameor cabinet I 9 in the disclosure as made.

A latch, denoted generally at 67, for retaining the lower, shorter arm 63 of the vertical lever BI engaged against the lower, shorter arm 5| of the vertical lever 49 to hold the integral hook 53 engaged between teeth 54 of the gear wheel 46, is situated in the upper compartment I8, at the side of the vertical lever 8| opposite the vertical the frame or cabinet. More explicitly, said latch 6'! is slidably supported by a bracket arm 68 fixed, as at 99, upon the upper surface of the partition wall l'l. Said bracket arm includes vertically spaced, upper and lower annular clamp elements 76 thereof, and the clamp elements 19 rigidly support parallel tubular guides i l, including a tubular guide if in each clamp element, disposed in perpendicular relation to the front A U-meinber 12 includes a base l3 H opposite the upper portion 98 of the vertical leverfil, an upper, shorter leg '54 thereof slidably mounted in the upper tubular guide H and a lower, longer leg 15 thereof slidably mounted in The free end portion 16 of the upper, shorter leg 79 extends a relatively short distance beyond the end of the corand the upper portion 69 of the vertical lever B! is adapted to be swung downwardly and disposed beneath said free end portion 16 to thus cause the integral hook 53 to be held between teeth 54 of the gear wheel 49, as these mentioned parts are disclosed in Fig. 2 and in full lines in Fig. 3. Spaced apart, vertical posts 17 secured to and extending downwardly from the upper wall H of the frame or cabinet 18 constitute means for guiding said'longer portion 69 for vertical swinging movement. The free end portion 18 of the lower, longer leg 15 extends a comparatively long distance beyond the end of the corresponding tubular guide opposite said base l3. As shown more clearly in Figs. 2 and 4, said free end portion 18 passes freely through an opening I9 in the front wall 13 and terminates within a vertical chamber 89 defined by a, desirably screen covered, housing 3! suitably and conveniently secured upon the frame or cabinet. An upwardly extending actuating pin 82 rigid with the lower, longer leg 15 and situated adjacent the free end of the upper, shorter leg '54, below and outwardly of said upper, shorter leg, is for a purpose to be set forth. A leaf spring 83 secured upon the end or side wall I5 and in engagement with the base 13 of the U-member l2 resiliently urges the upper and lower legs of said U-member in direction away from said leaf spring and toward the front wall I3.

A thermostatic element or bimetallic blade'84 is for causing the free end portion 16 of the upper, shorter arm 14 of the U-member I2 to become removed from its latching position above the upper portion 66 of the vertical lever BI, and

spent.

blade is situated in-an upper portion of said vertical'chamber at the outer side of and'ad- 'acent the freeend portion 18 of the longer, lower leg 15 of the u member'li. *The construction "and arrangement are such that when the thermostatic 'elementor bimetallic blade 84 is warped or'b'ent indirection toward said U-member 12, as m I'SSDOHSB'tQ the elevation of the temperature of atmospheric -air,'said element or blade will engage the freeend of the lower, longer leg 15 and cause the ,U member to he slid inwardly, so'that continued inward movement of "said -U-member will-cause the free end portion 16 of the upper,'shorterleg T4 to be removed or withdrawn from position'above the upper portion 66 of the leverfil. The element or blade '84 will of course push the U-member i2- inwardly against the weaker resilient action of the leaf spring 83.

disclosed in Figs. 2and 4, and in full lines in Fig. 3, the integral hook 53 will be situated between teeth '54 of the gear wheel 46 by the lower, shorter arm 63 of the vertical lever 6| to thus retain said gear wheel, the gearing 2|, the spring motor 29 and the siren 40 inactive. See the full line position of the lower, shorter arms 5| and 63 in Fig. '3. When, however, the thermostatic element or blade 84-is warped or bent to cause said free end portion 16 to be removed or withdrawn, the resilient element 59 "will act to release saidintegral hook from engagement with-said gear wheel46. See the dotted line positions of said arms 5| and 63 in said Fig. 3. Obviously, the alarm will become operative upon withdrawal of the integral hook 53 from the gear wheel 46, and actuation of said alarm cannot be stopped until the coil 01' clock spring 26 of the spring motor 20 has become That is, it is practically impossible to cause the integral hook 53 to become engaged between teeth 54 of the gear wheel 46 while said gear wheel is rapidly rotating.

A construction and arrangement for setting and re-setting the alarm is very plainly disclosed in Figs. 1' to 4 of the drawings.

A horizontal-guide rod 86 is disposed in the upper compartment l8 in slightly spaced, parallel relation to the front wall l3, and opposite ends of said guide rod 86 are rigidly supported, as at 81, upon the end or side walls I5 and I8.

An actuating knob 88 is situated at the outer side of the-front wall l3 of the frame or cabinet and is slidably mounted in an elongated slot 89 through said front wall. A vertical member 99 rigid with an inner portion of said knob 88 includes a forked portion 9| adapted for sliding movement along the guide rod '86. A tension coil spring 92 upon said guide rod 86 has one of its ends secured, as at '93, at or-adjacent to the side wall it, and its otherend secured, as at 94, to a carriage 95 adapted for sliding movement along the guide rod 86. The forked portion 9| is situated between and engaged by coils of the spring 92, and the construction and arrangement are such that the part 96 of said coil spring 92,'between the wall l6 and said forked portion 9|; is under suificient tension to normally retain the knob 88 at the end of the elongated slot 89 adjacent the wall I6 and the forked portion 9| at its farthest distance from the U- member 12. The part 9! of the coil spring 92, between said forked portion 9| and the slidable carriage 95, acts as a compression spring in the performance of its intended function. A stud 98 rigid with the carriage 95 extends inwardly from said carriage and is engaged against the concave side of the location '1 where the lower and upper portions and 56 of the upper, longer arm of the vertical lever 49 meet. The construction and arrangement are such that said part 91 of said coil spring 92 is under slight compression between the carriage 95 and the upper, longer arm of the vertical lever 49, but under insuflicient compression to maintain the integral hook 53 engaged between teeth 54 of the gearv wheel 46 against the stronger action of the resilient element 59 when the vertical lever BI is released from the latch 61.

A second coil spring 99 is slidably situated upon the guide rod 86 at the side of the carriage 95 opposite the coil spring 92 and between said carriage 95 and a second carriage I86. The 3 secured, as at I8I and I82 to the carriages 95 and I88, respectively.

A horizontal actuating rod I83, rigid with the vertical member 98 and guided at its end portion opposite said member by an eye I04 upon the front wall I3 of the frame or cabinet I6, is j 1 disposed in slightly spaced, parallel relation to said front wall at elevation somewhat above the guide rod 86. A stud I65, rigidly supported by the actuating rod I83 at location between the carriages 95 and II!!! and adjacent said carriage I00, extends downwardly to position where it will become engaged against the adjacent surface of the carriage I98 when the setting and re-setting mechanism is operated. Said carriage I86 includes a vertical bevel surface I86 at its side adjacent the U-member I2 adapted to become engaged against the upwardly extending actuating pin 82 when said setting and re-setting mechanism is operated.

The integral hook 53 is moved from its dotted line positon to its full line position in Fig. 3 by manual actuation of the knob 88 toward the left. Such actuation of said knob causes the part 97 of the coil spring 92 to be under compression suificiently great to move the upper, longer portion of the vertical lever 49 toward the left in said Fig. 3 against the weaker opposed action of the resilient element 59. The weight of the upper portion 66 of the vertical lever BI is sufficient to cause said upper portion to move downwardly by gravity when the lower, shorter arm 63 of said lever 6| is allowed to swing toward the right in Fig. 3 by movement of the lower, shorter arm 5I in direction away from said lower, shorter arm 63 and against the gear wheel 46. Continued actuation of the knob 88 in direction which causes the integral hook 53 to engage between gear teeth 54 of the gear wheel 46 causes the stud I65 to engage the carriage I69 and move said carriage against the resilient action of the coil spring 99, toward the U-member 12. In turn, the bevel surface I66 causes the pin 82 and the U-member I2 to 'be moved inwardly and the free end portion I6 to be withdrawn from beneath the upper portion 66 so that said portion 66 will travel by gravity to elevation just below said free end portion I6. Upon release of the knob 88 the several entities of the setting and re-setting mechanism will return to their normal positions, and the construction and arrangement are such that upon return of the knob 88 and associated parts to normal position, the carriage I96 releases the U-member 12 to the resilient action of the leaf spring 83 before the stud 98 upon the carriage releases the vertical lever 49 to the action of the resilient element 59. That is to say, as the entities of the setting and re-setting mechanism are returning to normal positions, the free end portion I6 of the U-member I2 becomes positioned over and across the upper surface of the portion 66 of the vertical lever 6| while the part 9! of the coil spring 92 is yet under sufiicient tension to be stronger than the resilient element 59.

Of course, the spring motor 28 will be wound up, in the manner as before set forth, while the gearing 2I is held stationary by engagement of the integral hook 53 between teeth 54 of the gear Wheel 46.

An L-shape element I01, secured to the upper end of the vertical lever 49, is for the purpose of indicating whether or not the alarm is set for operation. The outer end portion of said element I 61 is arranged in an arcuate slot I08 in the front wall I3 of the frame or cabinet I0 and includes a finger I 69 at the outer side of the frame or cabinet adjacent said slot. In the disclosure as made, said finger will be at an upper portion of the arcuate slot when the alarm is set and at a lower portion of said slot when the alarm not set, and, consequently, run down.

The resilient element or conducting member 59 is included in an electrical circuit also including a second conducting member IID insulatively supported, as at 68, upon the front wall I3 of the frame or cabinet I0 in adjacent relation to said element or member 59. The electrical circuit having the conducting members 59 and H9 additionally includes an instrument II 2, which as disclosed is an electric lamp, adapted to be energized to produce a discernible signal. A battery for energizing the instrument or electric lamp H2 is indicated at II3. A lead wire II4 extends from said battery to the instrument or lamp II2, a lead wire II5 extends'from said instrument or lamp to the conducting member 59, and a lead wire I I6 extends from the conducting member I II] to the battery.

The construction and arrangement are such that when the integral hook 53' is maintained between teeth 54 of the .gear wheel 46, the lug 58 upon the upper end of the vertical lever 49 retains the resilient conducting member 59 out of engagement with the conducting member I I 8, as in Fig. 3, and when the lower, shorter arm 5I of said lever 49 is released by the vertical lever 6| said resilient conducting member 59 not only acts to remove or withdraw said integral hook 53 from the gear wheel 46 but also engages itself against the conducting member I I6 to thus close the circuit including the instrument or lamp I I2. In short, the conducting members 59 and H6 constitute a switch adapted to be closed simultaneously with setting-off the sound producing device or siren 48 to cause a signal in remote relation the alarm to be made discernible.

What is claimed is:

1. In a temperature controlled alarm, a spring motor, a sound producing device, gearing operatively connecting said spring motor with said seesaw soundproducing. device, mechanism including. a first. pivoted "lever adapted to. be engaged with said geari'ng. to fasten the, gearing. in stationary, positionfto thus render. said spring motorinoperative and said sound" producing device inactive and a second-pivoted lever engaged. with saidfirst pivoted'lev er, a resilient element. having potential tending to removefsaid first pivoted lever from engagement with said gearing, a latch element for retaining said second pivoted lever against said first pivoted lever to retain the latter engaged with said -gearing in opposition to potential exerted by said resilient element, and a thermostaticelement for actuating said latch element to release saidsecond pivoted lever, to thus permit said resilient element'to remove said first pivoted lever from said' gearing. a

2. The combination as specified in claim 1, and means for re-setting said latch element after an actuation of said alarm to. retain said second pivoted lever engaged against said first pivoted lever and the first pivoted lever engaged with said gearing.

3. In a temperature controlled alarm, a spring motor, a sound producing device, gearing opera tively connecting said spring motor. with said sound producing device, mechanism including a first pivoted lever adapted to be engaged with said gearing to fasten the gearing in stationary position to thus render said spring motor inoperative and said sound producing device inactive and a second pivoted lever engaged with said first pivoted lever, a resilient element having potential tending to remove said first pivoted lever from engagement with said gearing, a slidable latch element for retaining said second pivoted lever against said first pivoted lever to retain the latter engaged with said gearing in opposition to potential exerted by said resilient element, and a thermostatic element for slidably actuating said latch element to release said second pivoted lever to thus permit said resilient element to remove said first pivoted lever from said gearing.

4. The combination as specified in claim 3, and means assisted by gravity for slidably resetting said latch element after an actuation of said alarm to retain said second pivoted lever engaged against said first pivoted lever and the first pivoted lever engaged with said gearing.

5. In a temperature controlled alarm, a spring motor, a sound producing device, gearing operatively connecting said spring motor with said sound producing device, mechanism including a pivoted lever adapted to be engaged with said gearing to fasten the gearing in stationary position to thus render said spring motor inoperative and said sound producing device inactive, a resilient conducting member, a conducting member adjacent said resilient conducting member, said resilient conducting member having potential tending to remove said pivoted lever from engagement with said gearing and tending to cause the resilient conducting member to become engaged with said conducting member, means for causing said resilient conducting member to remove said pivoted lever from said gearing and to itself engage said connecting member, an electrical circuit adapted to be made by engagement of said resilient conducting member with said conducting member, and an instrument in said electrical circuit adapted to be energized to produce a discernible signal. I

6. In a temperature controlled alarm, a spring from engagement with said gearing, a latch element, for. retaining. said second pivoted lever, against said first pivoted lever to retain the latter engaged with said gearing in opposition to 'potential exerted by said resilient element, and a temperature responsive element for accomplishing longitudinal. actuation of said latch element to cause said second pivoted lever to be released from said latch element and to permit said resil-' ient element to remove saidfirst pivoted lever from said gearing.

'7. The combination as specified in claim 6, and means for actuating said first. pivoted lever against the potential of said resilient element into engagement with said gearing thus to permit said latch element to be re-set after an actuation of said alarm to retain said second pivoted lever engaged against said first. pivoted lever and, the first pivoted lever engaged with said gearing.

8. The combination as specified in claim 3 and means for. actuating said first pivoted lever against the potential of said resilient element into engagement with said gearing thus to cause said second, pivoted lever to be situated, by gravity at position permitting. said latch element to be re-set after actuation of said alarm to retain the second pivoted lever engaged against said first pivoted lever and the first pivoted lever engaged with said gearing.

9. The combination as specified in claim 3, and .an entity actuable by said mechanism for indicating the position of said first pivoted lever.

10. In a temperature controlled alarm, a spring motor, a sound producing device, gearing operatively connecting said spring motor with said sound producing device, mechanism including a pivoted lever adapted to be engaged with said gearing to fasten the gearing in stationary position to thus render said spring motor inoperative and said sound producing device inactive, a resilient conducting member, and a conducting member adjacent said resilient conducting member, said conducting members together constituting a switch, and said resilient conducting member having potential tending to remove said pivoted lever from engagement with said gearing and tending to cause the resilient conducting member to become engaged with said conducting member.

11. In a temperature controlled alarm, a spring motor, a sound producing device, gearing operatively connecting said spring motor with said sound producing device, mechanism including a first pivoted lever adapted to be engaged with said gearing to fasten the gearing in stationary position to thus render said spring motor inoperative and said sound producing device inactive and a second pivoted lever engaged with said first pivoted lever, a resilient element having potential tending to remove said first pivoted lever from engagement with said gearing, a latch element for retaining said second pivoted lever against said first pivoted lever to retain the latter engaged with said gearing in opposition to potential exerted by said resilient element, a thermostatic element for, actuating said latch element to release said second pivoted lever to thus permit said resilient element to remove said first pivoted lever from said gearing, and an entity actuated by said mechanism for indicating the position of one of said pivoted levers.

12. The combination as specified in claim 1, and means assisted by gravity for re-setting said latch element.

13. In a temperature controlled alarm, a spring motor, a soundproducing device, gearing operatively connecting said spring motor with said sound producing device, mechanism including a first pivoted lever adapted to -be engaged with said gearing to fasten the gearing in stationary position to thus render said spring motor inoperative and said sound producing device inactive and a second pivoted lever engaged with said first pivoted lever, a resilient element having -potential tending to remove said first pivoted lever from engagement with said gearing, a latch element for retaining said second pivoted lever against said first pivoted lever to retain the 1atter engaged with said gearing in opposition to potential exerted by said resilient element, a temperature responsive element for accomplishing longitudinal actuation of said latch element to cause said second pivoted lever tobe released from said latch element and to permit said resilient element to remove said first pivoted lever from said gearing, and means for actuating one of said pivoted levers thus to permit said latch element to be re-set.

14. The combination as specified in claim 6, and means for re-setting said latch element.

15. In a temperature controlled alarm, a

spring motor, a sound producing device, gearing operatively connecting said spring motor with said sound producing device, mechanism including a first pivoted lever adapted to be engaged with said gearing to fasten the gearing in stationary position to thus render said spring motor inoperative and said sound producing device inactive and a second pivoted lever engaged with said first pivoted lever, a resilient element having potential tending to remove said first pivoted lever from engagement with said gearing, a latch element for retaining said second pivoted lever against said first pivoted lever to retain the latter engaged with said gearing in opposition to potential exerted by said resilient element, and a thermostatic element for actuating said latch element to cause said mechanism to release said gearing.

16. In a temperature controlled alarm, a spring motor, a sound producing device, gearing operatively connecting said spring motor with said sound producing device, mechanism including a first pivoted lever adapted to be engaged with said gearing to fasten the gearing in stationary position to thus render said spring motor inoperative and. said sound producing device inactive and a second pivoted lever engaged with said first pivoted lever, means for removing said first pivoted lever from engagement with said gearing, a latch element for retaining said second pivoted lever against said first pivoted lever and the latter against said gearing, and a temperature responsive element for actuating said latch element to cause said means to release said gearing.

HAROLD B. MILLER. AXEL T. ANDERSON. 

